Effects of the 2011 Texas Drought on Soil Moisture Capacity in the Somerville Watershed
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Effects of the 2011 Texas Drought on Soil Moisture Capacity in the
Somerville WatershedChris Ingenloff
22 November 2011
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Introduction Background Problem Definition Watershed Statistics Methodology Required Work
Agenda
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Brazos River Basin Lake Somerville
Watershed
Introduction
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Texas 2011 Drought◦ High temperatures◦ Low precipitation◦ Record low reservoir
levels High demand for
sustained soil moisture
Similar conditions expected for the next 1-2 years
Background5%
5% 1%
11%
12%
2%
21%
15%
7%
16%
5%
Somerville Basin Land Cover
Open Water
Developed
Barren Land
Deciduous Forest
Evergreen Forest
Mixed Forest
Shrub/ Scrub
Grassland/ Herbaceous
Pasture/ Hay
Cultivated Crops
Wetlands
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Soil Recovery and “Memory”◦ Porosity◦ Field Capacity◦ Wilting Point◦ Residual Moisture
Content
The Problem
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Watershed Statistics
0.001
0.01
0.1
1
10
100
1000
10000
100000
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0
Flow (cfs)
Percent Occurrence
Flow Probability in the Somerville Basin
Middle Yegua Creek
East Yegua Creek
Davidson Creek
Yegua Creek at Someville
-40
-20
0
20
40
60
80
100
120
0 1 2 3 4 5 6 7 8 9 10 11 12
Temperature(F)
Month
Temperature Statistics in the Somerville Watershed
Mean
Average High/Low
Standard Devation
Average 2010 High
Average 2011 High
2012 Projection
0
2
4
6
8
10
12
1 2 3 4 5 6 7 8 9 10 11 12
Precipitation(in)
Month
Precipitation Statistics in the Somerville Watershed
Mean
Standard Deviation
2010
2011
2012 Projection
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Spatial Moisture Content Prediction
Soil Recovery Coefficient
Quantitative Impact of Critical Moisture Content
Water Balance1) dSoil Moisture = Precipitation – Runoff – Evapotranspiration
Methodology
Soil Hydraulic Properties
(raster)
Statistical Precipitation
Model
Runoff/Flow Correlation
(raster)
Statistical Temperature
Model
Statistical ET Analysis
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Evapotranspiration Statistical Analysis◦ MODIS Toolbox
LDAS Soil Data to Raster Evaluate
Required Work
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Questions?